AMS 5663
Nickel Alloy, Corrosion and Heat-Resistant, Bars, Forgings, and Rings, 52.5Ni - 19Cr - 3.0Mo - 5.1Cb - 0.90Ti - 0.50Al - 18Fe, Consumable Electrode or Vacuum Induction Melted, 1775 °F (968 °C) Solution and Precipitation Heat Treated
Material specification for Inconel 718 (UNS N07718) bars, forgings and rings, consumable-electrode or vacuum-induction melted, solution heat treated at about 1775 °F (968 °C) and precipitation heat treated by the producer.
What AMS 5663 specifies
AMS 5663 is the fully heat-treated form of the standard Inconel 718 bar specification: solution treat at 1700–1850 °F (925–1010 °C), cool rapidly, then age at 1325 ± 15 °F (718 ± 8 °C) for 8 h, furnace cool to 1150 ± 15 °F (621 ± 8 °C) and hold until the total ageing time reaches 18 h, then air cool. Minimum room-temperature properties are 185 ksi (1275 MPa) tensile, 150 ksi (1035 MPa) yield, 12 % elongation and 15 % reduction of area, with hardness of 331 HB (36 HRC) minimum; stress-rupture at 1200 °F (649 °C) under 100 ksi (690 MPa) must exceed 23 h with at least 4 % elongation. Composition, clean melting, grain size and macrostructure controls match AMS 5662. Parts machined from AMS 5663 stock need no further heat treatment, but any welding or re-solution treatment must be followed by the full age under AMS 2774.
Tests and the drawing call-out
Tests the document imposes
- Room-temperature tensile per ASTM E8/E8M on each lot
- Stress-rupture per ASTM E139 at 1200 °F / 100 ksi (23 h minimum, 4 % elongation)
- Hardness per ASTM E10 (331 HB minimum) or ASTM E18 (36 HRC minimum)
- Grain size per ASTM E112 and macrostructure / macro-etch
- Chemical analysis; ultrasonic inspection per AMS-STD-2154 when specified
How to cite it
Drawing call-out
MATERIAL: INCONEL 718 BAR PER AMS 5663 (SOLUTION AND PRECIPITATION HEAT TREATED), 36 HRC MIN; NO FURTHER HEAT TREATMENTAngle brackets mark the choices the drawing must make; every finish page shows a completed example.
Heat treatments specified to AMS 5663
| Treatment | Role | Cost |
|---|---|---|
Age (Inconel 718) is a precipitation-hardening condition for Inconel 718 (UNS N07718) and Alloy 718 AM. | Governing | $$$$ |
AMS 5663 — frequently asked
Why a two-step age with a furnace cool?
The 1325 °F step nucleates a fine, dense dispersion of gamma-double-prime Ni3Nb with some gamma-prime; cooling slowly to 1150 °F and holding grows the precipitates to the size that gives peak yield strength without coarsening into the brittle delta phase. Skipping the second step leaves strength short and hardness low.
What hardness should I read on 5663 stock?
At least 36 HRC (331 HB), typically 40–44 HRC in practice. Readings below 36 HRC point to an incomplete age, a mixed lot or a decarburized skin on the test surface; readings above 45 HRC are unusual and worth a second look at the test setup.
Can 5663 parts be welded?
Yes — 718 is one of the most weldable superalloys — but the heat-affected zone over-ages and the weld metal is un-aged. For full properties the part is re-solution treated and re-aged after welding; post-weld ageing alone (without re-solution) is a common compromise for repairs and is rated to lower properties.
How does AMS 5663 relate to ASTM B637 and ASTM F3055?
ASTM B637 covers the same alloy (UNS N07718) for industrial use with a similar age; AMS 5663 adds aerospace melt, grain and stress-rupture requirements. ASTM F3055 applies the same solution-and-age chemistry to powder-bed-fusion 718, typically after hot isostatic pressing.
AMS 5663 is copyrighted by SAE International. This page explains the document so a drawing can be read; it does not reproduce the standard. Purchase the current edition from the publisher. Official source ↗